I built a 40x50 steel building, welded, insulated, and ridge vents, and gutter system, back in 2003. Mine was turn-key, with two 12x12 doors, one front, one rear, one 10x10 front, two garage door openers, four windows, one pass through door. 12 ft. wide driveway 160 ft. leading to a 40x52 apron...